Okay describe the texture of this, Cactus:prikley,spikey,pokey
Where Cactus: is the item and all the answere are split() via comma into an array of acceptable answers.
$answ[0] = 'prickley';
$answ[1] = 'spikey';
$answ[2] = 'pokey';
You can do a for each to run though all answers and compare against user input.
So each admin could allow multiple answers to multiple questions. And you have on question with multiple add ons
i.e. Cactus:
That would make coding it a bit easier and easy to add to for admins.